TabHost整合Listview进行数据显示和单独准确绑定listview中的控件
情况：最近ostocy-jshop这个开源项目，一直在进行pad版本的更新工作。今天把遇到的一些问题说说。
1，我们要实现的功能是，动态获取商品分类，加载到tabhost中，并切换tabhost读取商品分类下的商品。且能够单独绑定listview中的imageview和其他控件。
这个功能在网上搜索后的问题有如下几点：
1，listview的onclick事件覆盖了imageview的事件。
2，tabhost在extends 和 implements TabContentFactory的时候只会在第一次进入新tabhost的title才会读取。这不能符合我们的要求，我们希望每次切换tabhost都可以进行数据的读取。
3，图片的压缩避免内存溢出。
我们的代码解决了如上2个问题。
主要的思路是：
1，重写BaseAdapter对listview的空间进行单独绑定。
2，在继承 extends TabActivity implements TabContentFactory 并实现public View createTabContent(String tag) 方法后，同时给tabhost绑定onclick事件。但是这样可能会带来重复2次读取的操作，但是也就仅限在第一次，反复读取后并不会有重复的问题。
3，对读取的图片进行压缩动作，并把原始图片进行调整大小处理。
接下来贴出所有的代码
主体
package com.jshop.android.shop;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.AlertDialog;
import android.app.TabActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabContentFactory;
import android.widget.TextView;
import com.jshop.android.action.JshopMGoodsListAction;
import com.jshop.android.action.JshopMelectrocartAction;
import com.jshop.android.action.JshopMgoodscategoryListAction;
import com.jshop.android.holder.ElecartListViewHolder;
import com.jshop.android.holder.GoodsListViewHolder;
import com.jshop.android.index.R;
import com.jshop.android.shop.JshopActivityGoodsList.JshopActivityGoodsListPageChangeListener;
import com.jshop.android.sqlite.DBHelper;
import com.jshop.android.util.Arith;
import com.jshop.android.util.BaseTools;
import com.jshop.android.widget.JshopListViewAdapter;
import com.jshop.android.widget.JshopViewpagerAdapter;
import com.jshop.android.widget.JshopViewpagerAdapter.JshopActivityGoodsListPageAdapter;
public class JshopActivityNGoodsList extends TabActivity implements TabContentFactory{
private final DBHelper dbhelper=new DBHelper(this);
private String[]tabTitle=null;
private GridView gv;
private ListView listViews;//used by goodslist
private ListView listViewForCart;//used by cartlist
private TextView totalmemberprice;//显示我的菜单总价
private Double total=0.0;
private List<Map<String,Object>>goodscategoryList=new ArrayList<Map<String,Object>>();//商品分类
private ArrayList<HashMap<String, Object>> electrocartgoodslists = new ArrayList<HashMap<String, Object>>();//elecart
private ArrayList<HashMap<String, Object>> goodslists = new ArrayList<HashMap<String, Object>>();//商品列表
private JshopMgoodscategoryListAction jmgclAction=new JshopMgoodscategoryListAction();
private JshopMGoodsListAction jmGoodslistAction=new JshopMGoodsListAction();
private JshopMelectrocartAction jmelecart=new JshopMelectrocartAction();
@SuppressWarnings("unchecked")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
super.requestWindowFeature(Window.FEATURE_NO_TITLE);//设置无标题窗口
super.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//全屏模式
super.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//强制为横屏
this.setContentView(R.layout.jshop_m_newgoodslist);
listViews=(ListView)this.findViewById(R.id.listViewfornewgoods);//商品列表的listview
listViewForCart=(ListView)this.findViewById(R.id.listViewforelecart);//我的菜单listview
setElecartListView();//调用读取我的菜单数据
//读取商品分类缓存
Cursor c=dbhelper.query(DBHelper.GOODS_CATEGORY_TM_NAME);
goodscategoryList=jmgclAction.getGoodsCategoryListtoSQLite(c);
c.close();
if(goodscategoryList.isEmpty()){
goodscategoryList=jmgclAction.getGoodsCategoryList();
//缓存goodscategorylist
jmgclAction.setGoodsCategoryListtoSQLite(goodscategoryList, this.getApplicationContext());
}
setTabTitle(goodscategoryList);
if(tabTitle!=null){
final TabHost th = getTabHost();
for(int i = 0; i < tabTitle.length;i++){
LinearLayout view = (LinearLayout) getLayoutInflater().inflate(R.layout.jshop_m_textfortabtitle,null);
((TextView) view.findViewById(R.id.tv_title)).setText(tabTitle[i]);
th.addTab(th.newTabSpec(tabTitle[i]).setIndicator(view).setContent(this));
}
th.getTabWidget().getChildAt(th.getCurrentTab()).setBackgroundColor(Color.parseColor("#ff58a300"));
th.setOnTabChangedListener(new OnTabChangeListener(){
@Override
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
SimpleListView(tabId);
// change tab background color to red
for (int i = 0; i < th.getTabWidget().getChildCount(); i++) {
th.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#ff003464"));
/**
* set height and width under TabActivity setting width has no
* effect due to fill_parent layout parameter
*/
//NOTE i cannot get this part work properly.
//tabHost.getTabWidget().getChildAt(i).getLayoutParams().height = 30;
//tabHost.getTabWidget().getChildAt(i).getLayoutParams().width = 30;
View tempView= th.getTabWidget().getChildAt(i);
/**
* I kept all drawables in selector so that the we could get correct
* drawablea applied to tabs as the selector pointed to has both the
* tabs and the bottom tab-bar drawables referenced
*/
//tempView.setBackgroundDrawable(res.getDrawable(R.drawable.somedrawable));
}
// o set different color for current selected tab to blue
th.getTabWidget().getChildAt(th.getCurrentTab()).setBackgroundColor(Color.parseColor("#ff58a300"));
}
});
}
}
/**
* 读取我的菜单数据
*/
public void setElecartListView(){
electrocartgoodslists.clear();
//读取ele_cart缓存
Cursor ec=dbhelper.query(DBHelper.ELE_CART_TM_NAME);
electrocartgoodslists=jmelecart.getElecarttoSQLite(ec);
ec.close();
listViewForCart.setAdapter(new JshopMyElecartListViewAdapter(electrocartgoodslists,this.getApplicationContext()));
setTotalMemberprice();
}
/**
* 设置计算我的菜单总价
*/
public void setTotalMemberprice(){
total=0.0;
if(!electrocartgoodslists.isEmpty()){
for(int i=0;i<electrocartgoodslists.size();i++){
total=Arith.add(total, Arith.mul(Double.parseDouble(electrocartgoodslists.get(i).get("memberprice").toString()), Double.parseDouble(electrocartgoodslists.get(i).get("needquantity").toString())));
}
totalmemberprice=(TextView) this.findViewById(R.id.totalmemberprice);
totalmemberprice.setText("￥"+total);
}else{
totalmemberprice=(TextView) this.findViewById(R.id.totalmemberprice);
totalmemberprice.setText("￥"+total);
}
}
/**
* 刷新我的菜单数据
*/
// public void rfreshElecartListView(){
// electrocartgoodslists.clear();
// //读取ele_cart缓存
// Cursor ec=dbhelper.query(DBHelper.ELE_CART_TM_NAME);
// electrocartgoodslists=jmelecart.getElecarttoSQLite(ec);
// ec.close();
//
// }
/**
* 动态获取tabhost需要的title
* @param goodscategoryList
* @return
*/
@SuppressWarnings("unused")
private void setTabTitle(List<Map<String,Object>>goodscategoryList){
String [] t=new String[goodscategoryList.size()];
for(int i=0;i<goodscategoryList.size();i++){
t[i]=goodscategoryList.get(i).get("name").toString();
}
this.tabTitle=t;
}
/**
* 切换tabhost时调用的方法
* @param tag
* @return
*/
public View SimpleListView(String tag){
collectSqliteGoodsList(tag);
listViews.setAdapter(new JshopMyGoodsListViewAdapter(goodslists,this.getApplicationContext()));
return listViews;
}
@Override
public View createTabContent(String tag) {
View view = new View(this);
if(tabTitle!=null){
if(tabTitle[0].equals(tag)){
collectSqliteGoodsList(tag);
}else if (tabTitle[1].equals(tag)){
collectSqliteGoodsList(tag);
}else if (tabTitle[2].equals(tag)){
collectSqliteGoodsList(tag);
}else{
collectSqliteGoodsList(tag);
}
listViews.setAdapter(new JshopMyGoodsListViewAdapter(goodslists,this.getApplicationContext()));
}
return view;
}
@SuppressWarnings("unused")
private void collectSqliteGoodsList(String tag){
Cursor c=dbhelper.queryByParamGoodsCategoryTName(DBHelper.GOODS_TM_NAME,tag);
try {
goodslists=jmGoodslistAction.getGoodsListSQLite(c);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
c.close();
}
/**
* 点击加入我的菜单
* @param goodslists
* @param arg2
*/
public void showConfirmAddtoCart(final ArrayList<HashMap<String, Object>> goodslists,final int arg2){
AlertDialog.Builder bulider=new AlertDialog.Builder(this);
bulider.setMessage("确定加入我的菜单吗?").setCancelable(false).setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String goodsid=goodslists.get(arg2).get("goodsid").toString();
String goodsname=goodslists.get(arg2).get("goodsname").toString();
String memberprice=goodslists.get(arg2).get("memberprice").toString();
String pictureurl=goodslists.get(arg2).get("pictureurl").toString();
String needquantity="1";
jmelecart.setGoodsToElecartSQLite(goodsid,goodsname,memberprice,pictureurl,needquantity, getApplicationContext());
setElecartListView();
}
}).setNegativeButton("取消", null);
AlertDialog alert=bulider.create();
alert.show();
}
/**
* 商品listview的适配器
* @author "chenda"
*
*/
public class JshopMyGoodsListViewAdapter extends BaseAdapter {
private ArrayList<HashMap<String, Object>> list;
private LayoutInflater myInflater;
public JshopMyGoodsListViewAdapter(
ArrayList<HashMap<String, Object>> list, Context context) {
this.list = list;
this.myInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
GoodsListViewHolder holder = null;
if (convertView == null) {
holder = new GoodsListViewHolder();
convertView = myInflater.inflate(
R.layout.jshop_m_listforcategory, null);
holder.setPictureurl((ImageView) convertView
.findViewById(R.id.pictureurl));
holder.setGoodsname((TextView) convertView
.findViewById(R.id.goodsname));
holder.setMemberprice((TextView) convertView
.findViewById(R.id.memberprice));
holder.setWeight((TextView) convertView
.findViewById(R.id.weight));
holder.setUnitname((TextView) convertView
.findViewById(R.id.unitname));
holder.setAddtomyelecartmenu((ImageView) convertView
.findViewById(R.id.addtomyelecartmenu));
holder.setDetail((TextView) convertView
.findViewById(R.id.detail));
convertView.setTag(holder);
} else {
holder = (GoodsListViewHolder) convertView.getTag();
}
holder.getPictureurl().setImageBitmap(
(Bitmap) list.get(position).get("pictureurl"));
holder.getGoodsname().setText(
list.get(position).get("goodsname").toString());
holder.getMemberprice().setText(
list.get(position).get("memberprice").toString());
holder.getWeight().setText(
list.get(position).get("weight").toString());
holder.getUnitname().setText(
list.get(position).get("unitname").toString());
holder.getDetail().setText(
list.get(position).get("detail").toString());
holder.getAddtomyelecartmenu().setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showConfirmAddtoCart(list,
position);
}
});
holder.getPictureurl().setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
}
});
return convertView;
}
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
}
}
/**
/**
* 我的elecart的适配器
* @author "chenda"
*
*/
public class JshopMyElecartListViewAdapter extends BaseAdapter {
private final ArrayList<HashMap<String, Object>> list;
private LayoutInflater myInflater;
public JshopMyElecartListViewAdapter(
ArrayList<HashMap<String, Object>> list, Context context) {
this.list = list;
this.myInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View convertView,
final ViewGroup parent) {
ElecartListViewHolder holder = null;
if (convertView == null) {
holder = new ElecartListViewHolder();
convertView = myInflater.inflate(
R.layout.jshop_m_detaillistview, null);
holder.setGoodsname((TextView) convertView
.findViewById(R.id.goodsname));
holder.setMemberprice((TextView) convertView
.findViewById(R.id.memberprice));
holder.setNeedquantity((TextView) convertView.findViewById(R.id.needquantity));
holder.setPlus((ImageView) convertView.findViewById(R.id.plus));
holder.setMinus((ImageView) convertView.findViewById(R.id.minus));
convertView.setTag(holder);
} else {
holder = (ElecartListViewHolder) convertView.getTag();
}
holder.getGoodsname().setText(
list.get(position).get("goodsname").toString());
holder.getMemberprice().setText(
list.get(position).get("memberprice").toString());
holder.getNeedquantity().setText(
list.get(position).get("needquantity").toString());
holder.getPlus().setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
jmelecart.plusorMinusElecart(list, position, "plus", v.getContext());
setElecartListView();
setTotalMemberprice();
}
});
holder.getMinus().setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
jmelecart.plusorMinusElecart(list, position, "minus", v.getContext());
setElecartListView();
setTotalMemberprice();
}
});
return convertView;
}
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
}
}
}
/**
* 压缩图片
* to change sd card pc to bmp type
* @param pictureurl
* @return
* @throws IOException
*/
public static Bitmap GetLocalOrNetBitmap(String url) throws IOException
{
String sdcard=Environment.getExternalStorageDirectory().getPath();
BitmapFactory.Options options=new BitmapFactory.Options();
options.inSampleSize=6;
options.inTempStorage=new byte[5*1024];
Bitmap bitmap=BitmapFactory.decodeFile(sdcard+url,options);
return bitmap;
}
/**
* 不压缩图片
* to change sd card pc to bmp type
* @param pictureurl
* @return
* @throws IOException
*/
public static Bitmap GetLocalOrNetBitmapNoZip(String url) throws IOException
{
String sdcard=Environment.getExternalStorageDirectory().getPath();
BitmapFactory.Options options=new BitmapFactory.Options();
options.inTempStorage=new byte[5*1024];
Bitmap bitmap=BitmapFactory.decodeFile(sdcard+url,options);
return bitmap;
}
更多代码请关注 https://github.com/sdywcd/ostocy-jshop 中的jshop-android （项目会需要服务器端做支持，可能比较复杂。如果有问题欢迎通过站内信或者邮箱联系。）